Flow measurement device and measurement method based on mass method

Abstract

The present invention discloses a flow measurement device and a measurement method based on the mass method, including: an inner anti-evaporation cover; an outer anti-evaporation assembly, which covers the inner anti-evaporation cover, and a first humidity adjustment structure is arranged inside the outer anti-evaporation assembly; an evaporation well, which is arranged inside the inner anti-evaporation cover, an axially penetrating installation chamber is arranged on the inner side of the evaporation well, and a second humidity adjustment structure is arranged on the evaporation well; a weighing balance, which is arranged inside the installation chamber; a liquid collection container, which is arranged inside the installation chamber and placed on the weighing balance; a capillary receiving tube, the upper and lower ends of the capillary receiving tube respectively have a liquid receiving port and a liquid discharge port, the lower end of the capillary receiving tube extends into the liquid collection container, and the upper end of the capillary receiving tube passes through the inner anti-evaporation cover and extends into the outer anti-evaporation assembly; a liquid outlet pipe, the end of the liquid outlet pipe is provided with a liquid outlet, and the liquid outlet passes through the outer anti-evaporation assembly and is aligned with the liquid receiving port and maintains a first distance. The present invention solves the problem of low measurement accuracy of micro flow rates in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of flow measurement, and in particular, to a flow measurement device and a measurement method based on the mass method. Background Art

[0002] Existing micro flow measurement technologies basically adopt the mass method. By injecting the liquid with the flow rate to be measured into a container and then performing timed weighing to accumulate the flow rate, the average flow rate error is obtained. According to the liquid collection form, it can be divided into the case where the liquid outlet needle is immersed or suspended in the liquid level of the collection container. Among them, the liquid collection form with the needle immersed below the liquid level can be further divided into whether there is an oil film covering.

[0003] In practical applications, these collection forms have their own advantages and disadvantages: for the case where the needle is immersed in the liquid level, although the accumulation of liquid at the needle is eliminated, however, due to the additional force generated by the surface tension formed between the needle and the liquid level in the container acting on the balance, during the process of continuously injecting liquid into the container and causing the liquid level to continuously rise, the liquid outlet pressure and surface tension of the needle will continuously change, resulting in measurement errors. If there is an oil film covering the liquid level, this error will be further increased.

[0004] Another improvement method is to vertically suspend the needle on the capillary of the collection container to form a continuous liquid column with a very small height, and at the same time guide the liquid to continuously flow downward to keep the liquid level constant, so as to avoid the influence of the liquid level change on the surface tension.

[0005] When the above measurement method is used, first, the liquid between the needle and the capillary, and the liquid between the capillary and the container are prone to evaporation, resulting in an increase in measurement errors. And after forming a continuous liquid column through the capillary, the liquid continuously flows into the container, resulting in the lack of a stable reading time for the weighing balance and affecting the measurement accuracy. Summary of the Invention

[0006] The main object of the present invention is to provide a flow measurement device based on the mass method to solve the problems in the related technologies that the liquid between the needle and the capillary, and the liquid between the capillary and the container are prone to evaporation, resulting in an increase in measurement errors, and after forming a continuous liquid column through the capillary, the liquid continuously flows into the container, resulting in the lack of a stable reading time for the weighing balance and affecting the measurement accuracy.

[0007] To achieve the above object, the present invention provides a flow measurement device based on the mass method, including:

[0008] Inner anti-evaporation cover;

[0009] An external anti-evaporation component, the external anti-evaporation component covers the internal anti-evaporation cover, and a first humidity adjustment structure is arranged inside the external anti-evaporation component, and the first humidity adjustment structure is used to increase the humidity inside the external anti-evaporation component;

[0010] An evaporation well is arranged inside the internal anti-evaporation cover. An installation chamber is arranged axially through on the inner side of the evaporation well. A second humidity adjustment structure is arranged on the evaporation well, and the second humidity adjustment structure is used to increase the humidity inside the installation chamber;

[0011] A weighing scale is arranged inside the installation chamber;

[0012] A liquid collection container is arranged inside the installation chamber and placed on the weighing scale;

[0013] A capillary receiving tube, the upper and lower ends of the capillary receiving tube respectively have a liquid receiving port and a liquid discharge port. The lower end of the capillary receiving tube extends into the liquid collection container, and the upper end of the capillary receiving tube passes through the internal anti-evaporation cover and extends into the external anti-evaporation component;

[0014] A liquid outlet pipe, the end of the liquid outlet pipe is provided with a liquid outlet. The liquid outlet passes through the external anti-evaporation component and is aligned with the liquid receiving port and maintains a first distance, so that the liquid discharged from the liquid outlet is intermittently sucked into the liquid receiving port.

[0015] Further, it further includes a filler component arranged inside the liquid collection container. The filler component is made of a low water absorption material and can be breathable. There is an accommodation cavity for accommodating the liquid to be measured between the lower end of the filler component and the bottom of the liquid collection container;

[0016] The lower end of the capillary receiving tube passes through the filler component and extends into the accommodation cavity.

[0017] Further, the external anti-evaporation component includes an external wind shield and an external anti-evaporation cover. The external anti-evaporation cover is arranged on the top of the internal anti-evaporation cover. The external wind shield covers the outside of the external anti-evaporation cover and the internal anti-evaporation cover. The first humidity adjustment structure is arranged inside the external anti-evaporation cover and is used to increase the humidity inside the external anti-evaporation cover;

[0018] The upper end of the capillary receiving tube extends into the external anti-evaporation cover, and the liquid outlet of the liquid outlet pipe passes through the external wind shield and the external anti-evaporation cover in sequence and is aligned with the liquid receiving port.

[0019] Further, the first humidity adjustment structure includes a wet water absorption strip, and the water absorption strip is embedded on the inner side of the external anti-evaporation cover.

[0020] Further, the second humidity adjustment structure includes a receiving groove provided at the upper end of the evaporation well, and a liquid that can evaporate is received in the receiving groove.

[0021] Further, the first spacing is smaller than the outer diameter of the liquid outlet, and larger than the maximum distance required to form a continuous liquid column between the liquid outlet and the liquid receiving port.

[0022] Further, the first spacing is smaller than 1 / 2 of the outer diameter of the liquid outlet.

[0023] Further, the packing component includes a sealing packing and an exhaust pipe. The sealing packing is made of a material with low water absorption rate, and the exhaust pipe penetrates through the sealing packing.

[0024] Further, the inner diameter of the exhaust pipe is smaller than the inner diameter of the liquid outlet pipe.

[0025] According to another aspect of the present invention, there is provided a flow rate measurement method, which uses the above-mentioned flow rate measurement device, and the following steps:

[0026] Extrude the liquid with the measured flow rate from the liquid outlet of the liquid outlet pipe to form a slightly convex liquid surface;

[0027] Use the liquid receiving port of the capillary receiving pipe to suck in the liquid extruded from the liquid outlet at intervals of T1 time;

[0028] After the liquid first drops from the liquid discharge port of the capillary receiving pipe into the liquid collection container, read the reading of the weighing scale at each T1 time interval;

[0029] Determine the liquid flow rate based on the readings of the weighing scale at each T1 time.

[0030] In the embodiment of the present invention, first, through the setting of the inner anti-evaporation cover, it is difficult for external air flow to affect the liquid in the liquid collection container and the liquid discharged from the liquid discharge port of the capillary receiving pipe. And after arranging the evaporation well in the inner anti-evaporation cover, the second humidity adjustment structure on the evaporation well can increase the humidity in the installation chamber, that is, increase the gas humidity in the liquid collection container, thereby reducing the humidity difference between the gas and the liquid in the liquid collection container, and further reducing the evaporation amount of this part of the liquid;

[0031] Secondly, through the setting of the outer anti-evaporation component, the liquid between the liquid outlet of the liquid outlet pipe and the liquid receiving port of the capillary receiving pipe is also not easily affected by external air flow. And after setting the first humidity adjustment structure in the outer anti-evaporation component, it can increase the humidity in the outer anti-evaporation component, that is, increase the gas humidity near the liquid outlet and the liquid receiving port, thereby reducing the humidity difference between the gas and the liquid in this area, and further reducing the evaporation amount of this part of the liquid.

[0032] Finally, through the settings of the inner anti-evaporation cover, the outer anti-evaporation component, the first humidity adjustment structure and the second humidity adjustment structure, the present invention can effectively reduce the evaporation amount of the liquid to be measured, thereby reducing the measurement error and improving the measurement accuracy;

[0033] On this basis, when there is a first distance between the liquid outlet of the liquid outlet pipe and the liquid receiving port of the capillary receiving pipe in the present invention, the continuous liquid flow is changed into an inhalation at equal time intervals, thereby providing a stable reading time for the weighing balance and improving the repeatability and accuracy of the flow measurement;

[0034] Moreover, the liquid inhaled by the capillary receiving pipe is stored in the capillary receiving pipe. Since the inner diameter of the capillary receiving pipe is extremely small, the contact area between its port and the external air is also extremely small, thus significantly reducing the liquid evaporation amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, making other features, objects and advantages of the present invention more obvious. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 is a schematic cross-sectional structure diagram of a micro-flow measurement device according to an embodiment of the present invention;

[0037] Figure 2 is a schematic structure diagram of a liquid outlet pipe and a capillary receiving pipe according to an embodiment of the present invention;

[0038] Figure 3 is a schematic structure diagram of a capillary receiving pipe according to an embodiment of the present invention;

[0039] Wherein, 1 is a liquid collection container, 101 is an accommodation cavity, 2 is a measured medium, 3 is a weighing balance, 4 is an inner anti-evaporation cover, 5 is a packing component, 50 is a sealing packing, 51 is an exhaust pipe, 6 is an outer wind shield, 7 is a liquid outlet pipe, 70 is a liquid outlet, 8 is a capillary receiving pipe, 80 is a first pipe section, 801 is a corner section, 81 is a second pipe section, 82 is a liquid discharge port, 83 is a liquid receiving port, 84 is a horizontal pipe section, 85 is a vertical pipe section, 9 is a first humidity adjustment structure, 10 is an outer anti-evaporation cover, 11 is an evaporation well, 13 is a second humidity adjustment structure, 131 is an accommodation groove, 132 is an evaporable liquid, 14 is an installation chamber, 15 is an outer anti-evaporation component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solution in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present invention here.

[0042] In the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0043] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0044] In addition, terms such as "arranged", "provided with", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the meaning of the term "plurality" should be two or more.

[0046] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will detail the present invention with reference to the accompanying drawings and in conjunction with the embodiments.

[0047] To solve related technical problems, as Figure 1 shown, this embodiment provides another flow measurement device based on the mass method, including:

[0048] Inner anti-evaporation cover 4;

[0049] The external anti-evaporation component 15 covers the internal anti-evaporation cover 4. A first humidity adjustment structure 9 is arranged inside the external anti-evaporation component 15, and the first humidity adjustment structure 9 is used to increase the humidity inside the external anti-evaporation component 15;

[0050] The evaporation well 11 is arranged inside the internal anti-evaporation cover 4. An installation chamber 14 that penetrates axially is arranged inside the evaporation well 11. A second humidity adjustment structure 13 is arranged on the evaporation well 11, and the second humidity adjustment structure 13 is used to increase the humidity inside the installation chamber 14;

[0051] The weighing scale 3 is arranged inside the installation chamber 14;

[0052] The liquid collection container 1 is arranged inside the installation chamber 14 and placed on the weighing scale 3;

[0053] The capillary receiving tube 8 has a liquid receiving port 83 and a liquid discharge port 82 at its upper and lower ends respectively. The lower end of the capillary receiving tube 8 extends into the liquid collection container 1, and the upper end of the capillary receiving tube 8 passes through the internal anti-evaporation cover 4 and extends into the external anti-evaporation component 15;

[0054] The liquid outlet pipe 7 has a liquid outlet 70 at its end. The liquid outlet 70 is aligned with the liquid receiving port 83 and maintains a first distance after passing through the external anti-evaporation component 15, so that the liquid discharged from the liquid outlet 70 is intermittently sucked into the liquid receiving port 83, and the liquid discharge port 82 intermittently drops the liquid into the liquid collection container 1.

[0055] In this embodiment, the evaporation well 11 is arranged inside the internal anti-evaporation cover 4. An installation chamber 14 that penetrates axially is arranged inside the evaporation well 11. The installation chamber 14 is sleeved outside the liquid collection container 1 and the weighing scale 3, and there is a gap between the installation chamber 14 and the liquid collection container 1 and the weighing scale 3; A second humidity adjustment structure 13 is arranged on the evaporation well, and the second humidity adjustment structure 13 is used to increase the humidity inside the installation chamber. In one implementation manner of the second humidity adjustment structure 13, the second humidity adjustment structure 13 includes a receiving groove opened at the upper end of the evaporation well, and an evaporable liquid is accommodated in the receiving groove.

[0056] Specifically, it should be noted that in this embodiment, an evaporation well 11 is additionally arranged inside the internal anti-evaporation cover 4. The evaporation well 11 is sleeved on the weighing scale 3 and the liquid collection container 1 through the installation chamber 14, and the evaporation well 11 maintains a gap with the weighing scale 3 and the liquid collection container 1 so that they do not contact, so that the weight of the evaporation well 11 will not affect the weighing scale 3. In this embodiment, the installation chamber 14 is a chamber that penetrates axially. The weighing scale 3 is located at the lower part of the installation chamber 14, and the capillary receiving tube 8 can enter the liquid collection container 1 through the upper part of the installation chamber 14.

[0057] To reduce the evaporation rate of the liquid in the liquid collection container 1, it is necessary to increase the humidity of the gas inside the inner anti-evaporation cover 4. For this purpose, in this embodiment, a receiving groove 131 is provided at the upper end of the evaporation well 11, and an evaporable liquid 132 is filled in the receiving groove 131. By evaporating the liquid in the receiving groove 131, the humidity inside the inner anti-evaporation cover 4 reaches saturation and remains constant, thereby minimizing the evaporation rate of the liquid in the liquid collection container 1 and further improving the measurement accuracy.

[0058] In one embodiment of the receiving groove 131, the receiving groove 131 can be set as an annular groove opened along the circumference of the evaporation well 11, and this annular groove is located outside the installation chamber 14.

[0059] On the basis of the above embodiment, to further reduce the evaporation rate of the liquid, as Figure 1 shown, the outer anti-evaporation assembly in this embodiment includes an outer wind shield 6 and an outer anti-evaporation cover 10. The outer anti-evaporation cover 10 is arranged on the top of the inner anti-evaporation cover 4, and the outer wind shield 6 covers the outside of the outer anti-evaporation cover 10 and the inner anti-evaporation cover 4; the upper end of the capillary receiving tube 8 extends into the outer anti-evaporation cover 10, and the liquid outlet 70 of the liquid outlet pipe 7 sequentially passes through the outer wind shield 6 and the outer anti-evaporation cover 10 and is horizontally aligned with the liquid receiving port 83; a first humidity adjustment structure 9 is arranged inside the outer anti-evaporation cover 10, and the first humidity adjustment structure 9 is used to increase the humidity inside the outer anti-evaporation cover 10. In one embodiment of the first humidity adjustment structure 9, the first humidity adjustment structure 9 includes a wet water-absorbing strip embedded in the outer anti-evaporation cover 10.

[0060] Specifically, in this embodiment, the outer anti-evaporation cover 10 is arranged on the top of the inner anti-evaporation cover 4 and is located inside the outer wind shield 6; the outer anti-evaporation cover 10 covers the part of the capillary receiving tube 8 that extends out of the inner anti-evaporation cover 4, that is, at least covers the horizontal tube section 84 of the capillary receiving tube 8, and the liquid outlet 70 of the liquid outlet pipe 7 passes through the outer anti-evaporation cover 10, that is, the horizontal liquid outlet section passes through the outer anti-evaporation cover 10 and is horizontally aligned with the horizontal tube section 84; a wet water-absorbing strip is arranged inside the outer anti-evaporation cover 10.

[0061] Since the liquid outlet 70 of the liquid outlet pipe 7 and the liquid receiving port 83 of the capillary receiving pipe 8 are not directly docked and there is a certain distance between the two, the liquid to be measured between the liquid outlet 70 and the liquid receiving port 83 will come into contact with the external air, resulting in a certain amount of evaporation. For this reason, in this embodiment, an outer anti-evaporation cover 10 is arranged on the top of the inner anti-evaporation cover 4. The outer anti-evaporation cover 10 covers the liquid outlet 70 and the liquid receiving port 83, and a wet water-absorbing strip is arranged inside the outer anti-evaporation cover 10. The liquid contained in the water-absorbing strip can make the air humidity inside the outer anti-evaporation cover 10 reach a stable humidity saturation state, so that the air humidity near the liquid outlet 70 and the liquid receiving port 83 is saturated, reducing the evaporation amount of the liquid during the process of being inhaled into the capillary receiving pipe 8 through the liquid receiving port 83, and further improving the measurement accuracy.

[0062] Further, the water-absorbing strips in this embodiment are arranged in two circles, and the two circles of water-absorbing strips are respectively embedded in the inner top surface of the outer anti-evaporation cover 10 and the outer top surface of the inner anti-evaporation cover 4.

[0063] The present invention first makes it difficult for external airflows to affect the liquid in the liquid collection container 1 and the liquid discharged from the liquid discharge port 82 of the capillary receiving pipe 8 through the setting of the inner anti-evaporation cover 4. And after arranging the evaporation well 11 in the inner anti-evaporation cover 4, the second humidity adjustment structure 13 on the evaporation well 11 can increase the humidity in the installation chamber 14, that is, increase the gas humidity in the liquid collection container 1, thereby reducing the humidity difference between the gas and the liquid in the liquid collection container 1, and further reducing the evaporation amount of this part of the liquid;

[0064] Secondly, through the setting of the outer anti-evaporation assembly 15, the liquid between the liquid outlet 70 of the liquid outlet pipe 7 and the liquid receiving port 83 of the capillary receiving pipe 8 is also not easily affected by external airflows. And after setting the first humidity adjustment structure 9 in the outer anti-evaporation assembly 15, the humidity inside the outer anti-evaporation assembly 15 can be increased, that is, the gas humidity near the liquid outlet 70 and the liquid receiving port 83 is increased, thereby reducing the humidity difference between the gas and the liquid in this area, and further reducing the evaporation amount of this part of the liquid.

[0065] Finally, the present invention can effectively reduce the evaporation amount of the liquid to be measured through the settings of the inner anti-evaporation cover 4, the outer anti-evaporation assembly 15, the first humidity adjustment structure 9 and the second humidity adjustment structure 13, thereby being able to reduce the measurement error and improve the measurement accuracy;

[0066] On this basis, when there is a first distance between the liquid outlet 70 of the liquid outlet pipe 7 and the liquid receiving port 83 of the capillary receiving pipe 8 in the present invention, the continuous liquid flow is changed into an inhalation at equal time intervals, thereby providing a stable reading time for the weighing balance 3 and improving the repeatability and accuracy of the flow measurement;

[0067] Moreover, the liquid sucked by the capillary receiving tube 8 is stored in the capillary receiving tube 8. Since the inner diameter of the capillary receiving tube 8 is extremely small, the contact area between its port and the external air is also extremely small, thus significantly reducing the evaporation amount of the liquid.

[0068] Based on the above-described embodiment, as Figure 1 shown, the measuring device in this embodiment further includes a packing component 5 disposed in the liquid collection container 1. The packing component 5 is made of a material with low water absorption rate and can be breathable. There is a receiving cavity 101 for accommodating the liquid to be measured between the lower end of the packing component 5 and the bottom of the liquid collection container 1;

[0069] The lower end of the capillary receiving tube 8 passes through the packing component 5 and extends into the receiving cavity 101.

[0070] In this embodiment, the installation process of the micro-flow measuring device can be as follows: Place the liquid collection container 1 on the weighing scale 3, and arrange the packing component 5 in the liquid collection container 1. Of course, the packing component 5 can also be arranged in the liquid collection container 1 first, and then the liquid collection container 1 with the packing component 5 can be placed on the weighing scale 3. The packing component 5 has different arrangement methods according to different packing types. When the packing component 5 includes a foamed type of packing, the packing component 5 can be formed in the liquid collection container 1 by foaming. When the packing component 5 is an independent component, the packing component 5 can be installed in the liquid collection container 1 for use. To improve the liquid weighing capacity of the liquid collection container 1, the weight of the packing component 5 can be as small as possible, that is, the packing component 5 needs to be made of a light material. In this embodiment, there is a receiving cavity 101 for accommodating the liquid to be measured between the lower end of the packing component 5 and the bottom of the liquid collection container 1. By using this receiving cavity 101, a certain amount of liquid, that is, the measured medium 2, can be accommodated. The volume of the receiving cavity 101 should be greater than the volume of the liquid required to complete the entire measurement process.

[0071] In addition, when the packing component 5 is arranged in the liquid collection container 1, the receiving cavity 101 forms a relatively closed space, thereby reducing the influence of the external air flow on the evaporation amount of the liquid in the receiving cavity 101 and restricting the receiving cavity 101 within a suitable range, which is beneficial to the measurement.

[0072] To enable the liquid in the liquid receiving tube to be smoothly injected into the receiving cavity 101, it is necessary to discharge the air in the receiving cavity 101 while injecting the liquid into the receiving cavity 101, so as to maintain the internal and external pressure balance and make the liquid flow smoothly.

[0073] Through the provision of the packing component 5, the accommodation cavity 101 in the liquid collection container 1 is in a relatively enclosed environment, and the liquid to be measured entering the accommodation cavity 101 is not easily affected by external airflows, reducing the evaporation amount of the liquid to be measured. At the same time, the packing component 5 confines the accommodation cavity 101 within a suitable range, and since the packing component 5 has air permeability, when the liquid to be measured flows into the accommodation cavity 101, the gas in the accommodation cavity 101 can be discharged, enabling the liquid to be measured to flow in smoothly.

[0074] In this embodiment, since the inner anti-evaporation cover 4 and the outer anti-evaporation component 15 are provided, in order to enable the air in the internal space to flow, exhaust holes may be opened in the inner anti-evaporation cover 4 and the outer anti-evaporation component 15, or there is non-sealed contact between the lower ends of the inner anti-evaporation cover 4 and the outer anti-evaporation component 15 and the bearing surface (such as a tabletop).

[0075] After placing the liquid collection container 1, the inner anti-evaporation cover 4 can be placed over the weighing balance 3 and the liquid collection container 1. Through the provision of the inner anti-evaporation cover 4, the liquid in the liquid collection container 1 is not easily affected by changes in external airflows, thereby reducing the evaporation amount of the liquid in the liquid collection container 1 and further reducing the measurement error. The overall dimensions of the inner anti-evaporation cover 4 can be designed according to the dimensions of the weighing balance 3 and the liquid collection container 1, and this embodiment does not limit it here. A first mounting hole may be opened at the upper end of the inner anti-evaporation cover 4, which corresponds to the middle part of the liquid collection container 1 up and down and is used for the capillary receiving tube 8 to pass through.

[0076] In addition, it should be noted that when the packing component 5 is formed in the liquid collection container 1 by foaming, the capillary receiving tube 8 can be first positioned in the middle of the liquid collection container 1 through a specific tooling, and then the packing component 5 is formed between the capillary receiving tube 8 and the side wall of the liquid collection container 1.

[0077] In this embodiment, the capillary receiving tube 8 is provided in an L shape, that is, the capillary receiving tube 8 includes a horizontal tube section 84 and a vertical tube section 85. The liquid receiving port 83 and the liquid discharge port 82 on the capillary receiving tube 8 are respectively located at the ends of the horizontal tube section 84 and the vertical tube section 85. The vertical tube section 85 can pass through the first mounting hole on the inner anti-evaporation cover 4 and then extend into the packing component 5, and then penetrate the packing component 5, so that the liquid in the capillary receiving tube 8 can be injected into the accommodation cavity 101 of the liquid collection container 1. The horizontal tube section 84 of the capillary receiving tube 8 is located above the inner anti-evaporation cover 4 and is used to cooperate with the liquid outlet tube 7 to suck the liquid extruded by the liquid outlet tube 7 into the capillary receiving tube 8.

[0078] After arranging the capillary receiving tube 8, the outer anti-evaporation component 15 can be covered outside the inner anti-evaporation cover 4 and on the capillary receiving tube 8. A second mounting hole can be formed on the side surface of the outer anti-evaporation component 15, and at least a part of the liquid outlet pipe 7 can pass through the second mounting hole in the horizontal direction to correspond to the liquid receiving port 83 of the capillary receiving tube 8. During the liquid injection process, the liquid flows out through the liquid outlet 70 of the liquid outlet pipe 7 and is inhaled into the capillary receiving tube 8 through the liquid receiving port 83. Therefore, under the action of the outer anti-evaporation component 15, the influence of external air flow changes on the liquid between the liquid outlet 70 and the liquid receiving port 83 can be reduced, and the evaporation amount of this part of the liquid can be reduced, thereby reducing the measurement error.

[0079] For the liquid outlet pipe 7, it also has a part that is horizontally aligned with the horizontal part of the capillary receiving tube 8, and the liquid outlet 70 of the liquid outlet pipe 7 is located at the end of this part of the liquid outlet pipe 7. In this embodiment, the liquid outlet 70 of the liquid outlet pipe 7 does not directly contact the liquid receiving port 83 of the capillary receiving tube 8, and there is a certain distance between the two, that is, the first distance. The specific value of the first distance should satisfy that the liquid extruded from the liquid outlet 70 can contact the liquid receiving port 83 after forming a micro-convex liquid surface of a certain size, and is inhaled into the capillary receiving tube 8 through the liquid receiving port 83, and no continuous liquid column will be formed between the liquid outlet 70 and the liquid receiving port 83 after inhalation. In other words, the capillary receiving tube 8 can inhale the liquid extruded from the liquid outlet 70 at intervals, and drip the liquid into the liquid collection container 1 through the liquid discharge port 82 at intervals.

[0080] In this embodiment, the flow measurement method using this micro-flow measurement device is as follows: The liquid with the measured flow rate is used as the measured medium 2 and extruded from the liquid outlet 70 of the liquid outlet pipe 7 to form a micro-convex liquid surface. After the liquid surface contacts the liquid receiving port 83 of the capillary receiving tube 8, it is quickly inhaled and cut off due to capillary action and gradually accumulates in the vertical part of the capillary receiving tube 8. After a certain mass of liquid accumulates in the vertical part, the liquid then drips from the lower end liquid discharge port 82 of the vertical part into the liquid collection container 1. Then, the mass of the current liquid collection container 1 can be obtained through the weighing balance 3, and then the mass of the dripped liquid can be obtained, so that the liquid flow rate can be obtained by using the mass method.

[0081] In this embodiment, first, under the horizontal alignment arrangement of the liquid outlet pipe 7 and the capillary receiving tube 8, the continuous liquid flow rate is changed into an inhalation at equal time intervals, thereby providing a stable reading time for the weighing balance 3 and improving the repeatability and accuracy of the flow measurement;

[0082] Then, through the arrangement of the inner anti-evaporation cover 4 and the outer anti-evaporation component 15, the liquid between the liquid outlet pipe 7 and the capillary receiving tube 8 and the liquid flowing into the liquid collection container 1 through the capillary receiving tube 8 are not easily evaporated due to the influence of external air flow;

[0083] Moreover, the liquid sucked into the capillary receiving tube 8 is stored therein. Since the inner diameter of the capillary receiving tube 8 is extremely small, the contact area between its port and the external air is also extremely small, thus significantly reducing the evaporation amount of the liquid.

[0084] In addition, since the liquid receiving port 83 of the capillary receiving tube 8 is horizontally aligned with the liquid outlet 70 of the liquid outlet pipe 7, the moving direction of the extruded liquid is perpendicular to the direction of gravity, which can reduce the protruding height of the micro convex liquid surface, so that the capillary receiving tube 8 can be as close as possible to the liquid outlet 70, reducing the volume and mass of the micro convex liquid surface, and reducing the evaporation amount of the micro convex liquid surface and the influence of the residual liquid droplets on the measurement result. At the same time, if an instantaneous tiny liquid column is generated between the liquid outlet 70 and the liquid receiving port 83, due to the capillary force among the liquid receiving end of the capillary receiving tube 8, the tiny liquid column, and the liquid outlet 70 being in the horizontal direction and orthogonal to the measurement direction of the weighing balance 3, the influence on the reading of the weighing balance 3 is reduced.

[0085] Meanwhile, since the liquid discharge port 82 of the capillary receiving tube 8 intermittently drops the liquid into the liquid collection container 1, a continuous liquid column will not be formed between the liquid discharge port 82 and the liquid collection container 1, so that there is no additional force between the capillary receiving tube 8 and the liquid collection container 1, and no measurement error will be caused when the flow rate changes.

[0086] Finally, since the filler assembly 5 is arranged in the liquid collection container 1, and the filler assembly 5 has the characteristics of low water absorption and air permeability, after the liquid is injected into the accommodation chamber of the liquid collection container 1, the air in the accommodation chamber can be discharged through the filler assembly 5, so that the pressure in the accommodation chamber is kept consistent with the ambient pressure, ensuring that the speed of the liquid being sucked is constant and not affected by the liquid injection amount.

[0087] In summary, the present invention realizes the technical effects of reducing the measurement error of the tiny flow rate and improving the measurement accuracy of the tiny flow rate through improvements in multiple directions of the measurement device, thus solving the problem of large measurement errors still existing in the measurement of tiny flow rates in the related art.

[0088] In addition, it should be noted that, in order to facilitate the formation of a certain micro convex liquid at the end of the liquid outlet pipe 7, in this embodiment, one end of the horizontal liquid outlet section of the liquid outlet pipe 7 close to the capillary receiving tube 8 is provided with a conical structure, and the diameter of the end of the conical structure close to the capillary receiving tube 8 is equal to the diameter of the liquid receiving port 83; the first distance is the distance between the end of the conical structure close to the capillary receiving tube 8 and the end of the liquid receiving port 83.

[0089] To enable the capillary receiving tube 8 to intermittently suck the liquid to be measured, the first spacing should meet certain conditions. When the first spacing is too small, a continuous liquid column will form between the liquid outlet 70 of the liquid outlet tube 7 and the liquid receiving port 83 of the capillary receiving tube 8. At this time, the capillary receiving tube 8 is in the process of continuous liquid intake, resulting in continuous dripping at the liquid discharge port 82 of the capillary receiving tube 8, and the weighing balance 3 lacks a suitable reading time. When the first spacing is too large, the micro-convex liquid surface extruded from the liquid outlet 70 may not be able to contact the liquid receiving port 83 of the capillary receiving tube 8, resulting in the inability to be normally sucked into the capillary receiving tube 8.

[0090] Therefore, in this embodiment, as Figure 2 shown, the first spacing is smaller than the outer diameter of the liquid outlet 70 and larger than the maximum distance required to form a continuous liquid column between the liquid outlet 70 and the liquid receiving port 83. Further, in a preferred embodiment, the first spacing is less than 1 / 2 of the outer diameter of the liquid outlet 70. In one embodiment, the minimum micro-convex liquid drop extruded from the liquid outlet 70 has a mass of 0.03 mg, and the degree of liquid drop protrusion can be determined according to the liquid tension.

[0091] On the basis that the capillary receiving tube 8 is set to be L-shaped, this embodiment further improves it. Specifically, since the inner diameter of the capillary receiving tube 8 is very small, the liquid storage capacity is extremely limited. If the cumulative volume of the sucked liquid is greater than the capillary volume, it will drip into the collection container. Once it drips, the liquid will expand into a flat thin layer, the surface area will increase significantly, and the evaporation amount will also increase sharply. Therefore, without affecting the capillary action of the capillary receiving tube 8, in order to increase the liquid holding capacity of the capillary receiving tube 8 and reduce the evaporation amount of the liquid, the capillary receiving tube 8 in this embodiment has a variable diameter structure.

[0092] Specifically, as Figure 1 and Figure 2 shown, in this embodiment, the capillary receiving tube 8 includes a first tube section 80 and a second tube section 81 that are connected to each other. The first tube section 80 includes a horizontal tube section 84, and the vertical tube section 85 includes the second tube section. The inner diameter of the second tube section 81 is larger than the inner diameter of the first tube section 80. The second tube section 81 vertically passes through the packing assembly and extends into the accommodation cavity 101, and the liquid discharge port 82 is located at the lower end of the second tube section 81; the first tube section 80 includes a horizontal section, and the liquid receiving port 83 is located at the end of the horizontal section.

[0093] In this embodiment, the inner diameter of the first pipe section 80 is relatively small, and it can suck in liquid under capillary action and hold a certain mass of liquid. The inner diameter of the second pipe section 81 is relatively large, which can significantly increase the liquid holding capacity. Under the combined action of the first pipe section 80 and the second pipe section 81, the capillary receiving pipe 8 can not only smoothly suck in liquid, but also increase the liquid holding capacity of the capillary receiving pipe 8, and can reduce the liquid evaporation amount with a smaller cross-sectional area.

[0094] Furthermore, since the capillary receiving pipe 8 in the present invention is L-shaped, it has two structural forms after being divided into the first pipe section 80 and the second pipe section 81. One of them is that the first pipe section 80 includes a part of the horizontal pipe section 84, and the second pipe section 81 includes a part of the horizontal pipe section 84 and all of the vertical pipe section 85. The other is that the first pipe section 80 includes all of the horizontal pipe section 84 and a part of the vertical section, and the second pipe section 81 includes the remaining vertical pipe section 85. Since the liquid needs to flow horizontally first and then vertically in the capillary receiving pipe 8. Therefore, in order to make the liquid flow process smoother, the capillary receiving pipe 8 in this embodiment is preferably in the structural form that the first pipe section 80 includes all of the horizontal pipe section 84 and a part of the vertical pipe section 85, and the second pipe section 81 only includes the remaining vertical pipe section 85.

[0095] Since the liquid changes from horizontal flow to vertical flow in the capillary receiving pipe 8 after being sucked in, the liquid in the vertical direction in the pipe moves downward under the action of gravity, but the movement direction of the liquid in the horizontal direction is perpendicular to the direction of gravity. Therefore, the liquid in the horizontal direction in the pipe must be continuous with the liquid in the vertical direction at the corner of the capillary receiving pipe 8 in order to achieve continuous liquid suction. For this reason, it is necessary to ensure that the corner of the capillary receiving pipe 8 is as smooth as possible without generating local resistance that causes the liquid continuity to be interrupted or gas to accumulate. If the radius of the corner is too large, it may cause the dimension of the capillary receiving pipe 8 extending out of the liquid collection container 1 to be too long, causing an off-center load problem of the balance. Therefore, the corner is further improved in this embodiment.

[0096] Specifically, the first pipe section 80 in this embodiment further includes a corner section 801 for connecting the horizontal pipe section 84 and the vertical pipe section 85. The inner surface of the corner section 801 is set as an arc surface, and the corner radius of the corner section 801 is 1D - 2D, where D is the outer diameter of the first pipe section 80. In addition, to ensure smooth liquid suction, the liquid receiving port 83 opposite to the liquid outlet pipe 7 should be cylindrical so that the capillary force does not change due to the change of the pipe diameter. Further, both the first pipe section 80 and the second pipe section 81 are cylindrical.

[0097] Since the inner diameter of the second pipe section 81 is larger than that of the first pipe section 80, in order to reduce the influence of the change of the pipe section inner diameter on the liquid in the first pipe section 80 after it enters the second pipe section 81, such as Figure 3As shown, the first pipe segment 80 and the second pipe segment 81 in this embodiment are connected by a transition segment 84. The transition segment 84 is set to be conical. The small-diameter end of the transition segment 84 is connected to the first pipe segment 80, and the large-diameter end of the transition segment 84 is connected to the second pipe segment 81. Thus, when the liquid enters the transition segment 84, it can fully wet the inner wall of the pipe and gradually exhaust the air, so that the liquid can flow smoothly in the transition segment 84 and the second pipe segment 81. In one embodiment of the transition segment 84, the angle between the generatrix and the axis of the transition segment 84 is 10° - 15°.

[0098] In addition, on this basis, the connection between the small-diameter end of the transition segment 84 and the first pipe segment 80 can be provided with an arc chamfer, and the connection between the large-diameter end of the transition segment 84 and the second pipe segment 81 can also be provided with an arc chamfer.

[0099] Since the packing assembly 5 needs to have the functions of low water absorption rate and air permeability in the present invention, in one embodiment of the packing assembly 5, the packing assembly 5 is made of a multi-porous material with low water absorption rate. The tiny pores can be used to exhaust the air after the liquid is injected into the accommodation cavity 101, so as to balance the internal and external pressures. For example, high molecular materials such as polyamide, polyethylene, and polypropylene with micropores can be used.

[0100] In another embodiment of the packing assembly 5, as Figure 1 and Figure 2 shown, the packing assembly 5 includes a sealing packing 50 and an exhaust pipe 51. The sealing packing 50 is made of a material with low water absorption rate and does not have air permeability. The air permeability requirement of the packing assembly 5 is realized through the exhaust pipe 51. Therefore, the exhaust pipe 51 penetrates through the sealing packing 50. After the liquid is injected into the accommodation cavity 101, the air in the accommodation cavity 101 can be discharged through the exhaust pipe 51, so as to maintain the balance of internal and external pressures.

[0101] In this embodiment, the sealing packing 50 is made of a foamed lightweight material with low water absorption rate and good elasticity. The inner diameter of the exhaust pipe 51 is the same as that of the liquid outlet pipe 7. The weights of the sealing packing 50 and the exhaust pipe 51 should be as small as possible to improve the liquid weighing capacity of the liquid collection container 1. After the sealing packing 50 is formed by foaming between the capillary receiving pipe 8 and the inner wall of the liquid collection container 1, according to the inner diameter value of the liquid outlet pipe 7 obtained from the minimum measured flow rate, the same exhaust pipe 51 is selected as the standard exhaust pipe 51, and the exhaust pipe 51 penetrates through the sealing packing 50 to achieve "liquid in and air out" at the same speed. Finally, for other measured flow rates, an integer multiple of the standard exhaust pipe 51 can be penetrated through the sealing packing 50 accordingly to achieve pressure balance under different flow rates.

[0102] In another embodiment, the sealing packing 50 can be a preformed component. When prefabricating, at least two axially penetrating through holes can be formed on the sealing packing 50. Since the sealing packing 50 is made of an elastic material, one of the through holes can be used for the second pipe section 81 of the capillary receiving pipe 8 to pass through and fit tightly, and the other through hole can be used for the exhaust pipe 51 to pass through and fit tightly. The outer diameter of the sealing packing 50 matches the inner diameter of the liquid collection container 1. Under the elastic action of the sealing packing 50, the sealing packing 50 can be inserted into the liquid collection container 1 and fixed.

[0103] In a preferred embodiment of the exhaust pipe 51, since the exhaust pipe 51 is used to discharge the gas in the liquid collection container 1 after the liquid enters the liquid collection container 1. When the inner diameter of the exhaust pipe 51 is the same as the inner diameter of the liquid outlet pipe 7, the internal and external pressure balance of the liquid collection container 1 can surely be achieved. However, considering that the viscosity of the gas is less than the viscosity of the liquid, the discharge rate of the gas will be greater than the inflow rate of the liquid, and the inner diameter of the exhaust pipe 51 will also affect the evaporation amount of the liquid in the liquid collection container 1. Therefore, in this embodiment, the inner diameter of the exhaust pipe 51 is set to be smaller than the inner diameter of the liquid outlet pipe 7, so that when the "liquid in and gas out" with equal speed can be achieved, the liquid evaporation amount can be further reduced and the measurement accuracy can be improved.

[0104] In the liquid collection container 1, the liquid discharge port 82 of the capillary receiving pipe 8 should not be in contact with the liquid surface that has been collected in the liquid collection container 1. The advantages are as follows: First, it avoids the influence of the acting forces such as surface tension, buoyancy, and liquid pressure caused by the insertion of the liquid discharge port 82 into the liquid surface on the liquid flow in the capillary receiving pipe 8, ensuring that the liquid discharge flow rate is stable and does not change due to the rise of the liquid surface in the liquid collection container 1.

[0105] Second, the traditional way of inserting the liquid discharge port 82 under the liquid surface requires a certain amount of liquid to be pre-stored in the liquid collection container 1 to cover the liquid discharge port 82, which reduces the effective weighing range, resulting in the use of a balance with a larger weighing value, correspondingly causing a certain weighing error and restricting the overall measurement accuracy. After controlling that the liquid discharge port 82 of the capillary receiving pipe 8 is not in contact with the liquid surface that has been collected in the liquid collection container 1, there is no need to pre-store liquid in the liquid collection container 1, and the effective weighing range accounts for at least more than 70% of the balance. A balance with a smaller weighing value can be selected, and the minimum weighing value is further improved, and the overall measurement accuracy is significantly improved.

[0106] To achieve the above object, the length of the liquid discharge port 82 extending out of the lower end of the sealing packing 50 needs to be determined according to the liquid capacity to be collected in the liquid collection container 1. Specifically, the distance between the liquid discharge port 82 and the inner bottom surface of the liquid collection container 1 is greater than the liquid height in the accommodation cavity 101 during the measurement process.

[0107] According to another aspect of the present invention, there is provided a method for measuring minute flow rate, using the above-mentioned minute flow rate measuring device, and the following steps:

[0108] Squeeze out the liquid with the measured flow rate from the liquid outlet 70 of the liquid outlet pipe 7 to form a slightly convex liquid surface;

[0109] Use the liquid receiving port 83 of the capillary receiving pipe 8 to suck in the liquid squeezed out from the liquid outlet 70 at intervals of T1;

[0110] After the liquid first drips from the liquid discharge port of the capillary receiving pipe 8 into the liquid collection container 1, read the reading of the weighing balance 3 at each T1 time interval;

[0111] Determine the liquid flow rate based on the readings of the weighing balance 3 at each T1 time.

[0112] Specifically, in this embodiment, the liquid with the measured flow rate is squeezed out from the liquid outlet 70 of the liquid outlet pipe 7 to form a slightly convex liquid surface. After the liquid surface contacts the liquid receiving port 83 of the capillary receiving pipe 8, it is quickly sucked in and cut off due to capillary action and gradually accumulates in the vertical part of the capillary receiving pipe 8. After a certain mass of liquid accumulates in the vertical part, the liquid then drips from the liquid discharge port 82 at the lower end of the vertical part into the liquid collection container 1. Then, the mass of the current liquid collection container 1 can be obtained through the weighing balance 3, and further the mass of the dripping liquid can be obtained, so that the liquid flow rate can be obtained by using the mass method. When using the mass method, the readings of each T1 can be accumulated to calculate the liquid flow rate.

[0113] Since there is a distance between the liquid outlet 70 of the liquid outlet pipe 7 and the liquid receiving port 83 of the capillary receiving pipe 8 in the present invention, the liquid squeezed out from the liquid outlet 70 needs to form a certain slightly convex liquid surface before being sucked in by the liquid receiving port 83. In this embodiment, the T1 time is the sum of the time required to form this slightly convex liquid surface and the time required for the liquid receiving port 83 to suck in this part of the liquid. Therefore, the specific value of T1 needs to be designed according to the properties of the liquid with the flow rate to be measured, the structure of the liquid outlet pipe 7, and the structure of the capillary receiving pipe 8. The specific value is not limited herein in this embodiment.

[0114] When the minute flow rate measuring device includes an evaporation well and an outer anti-evaporation cover, during the flow rate measurement, first control the air humidity in the inner anti-evaporation cover and the air humidity in the outer anti-evaporation cover to reach the set value, and then the liquid to be measured can be injected into the liquid outlet pipe to perform the above-mentioned flow rate measurement process. During the measurement process, the air humidity in the inner anti-evaporation cover and the air humidity in the outer anti-evaporation cover can be monitored in real time, and at the same time, the air humidity can be controlled to also reduce the liquid evaporation amount during the measurement process.

[0115] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flow measurement device based on a mass method, characterized in that: include: Internal evaporation shield; An outer anti-evaporation component, wherein the outer anti-evaporation component cover is arranged on the inner anti-evaporation cover, and a first humidity regulating structure is arranged in the outer anti-evaporation component, and the first humidity regulating structure is used to increase the humidity in the outer anti-evaporation component; An evaporation well is arranged in the inner anti-evaporation cover, an installation chamber is arranged inside the evaporation well and penetrates along the axial direction, a second humidity adjustment structure is arranged on the evaporation well, and the second humidity adjustment structure is used to increase the humidity in the installation chamber; A weighing balance, arranged in the installation chamber; a liquid collection container, arranged in the installation chamber and placed on the weighing scale; A capillary receiving tube, wherein the upper and lower ends of the capillary receiving tube are respectively provided with a liquid receiving port and a liquid discharge port, the lower end of the capillary receiving tube extends into the liquid collection container, and the upper end of the capillary receiving tube passes through the inner anti-evaporation cover and extends into the outer anti-evaporation component; A liquid outlet pipe, wherein a liquid outlet is provided at the end of the liquid outlet pipe, and the liquid outlet is aligned with the liquid receiving port after passing through the outer anti-evaporation component and maintains a first spacing, so that the liquid discharged from the liquid outlet is sucked into the liquid receiving port at intervals; The first interval is smaller than an outer diameter of the liquid outlet and larger than a maximum distance required to form a continuous liquid column between the liquid outlet and the liquid receiving port.

2. The flow measurement device according to claim 1, characterized in that: It also includes a packing assembly, which is arranged in the liquid collection container, the packing assembly is made of a material with low water absorption rate and is breathable, and a receiving cavity for receiving the liquid to be measured is provided between the lower end of the packing assembly and the bottom of the liquid collection container; The lower end of the capillary receiving tube passes through the filler component and then extends into the accommodating cavity.

3. The flow measurement device according to claim 1, characterized in that: The outer anti-evaporation assembly comprises an outer wind shield and an outer anti-evaporation shield, the outer anti-evaporation shield is arranged on the top of the inner anti-evaporation shield, the outer wind shield is arranged on the outer sides of the outer anti-evaporation shield and the inner anti-evaporation shield, and the first humidity adjustment structure is arranged in the outer anti-evaporation shield for increasing the humidity in the outer anti-evaporation shield; The upper end of the capillary receiving tube extends into the outer anti-evaporation cover, and the liquid outlet of the liquid outlet pipe sequentially passes through the outer windproof cover and the outer anti-evaporation cover and is aligned with the liquid receiving port.

4. The flow measurement device according to claim 3, characterized in that: The first humidity regulating structure comprises a moist water absorbing strip, and the water absorbing strip is embedded in the inner side of the outer anti-evaporation cover.

5. The flow measurement device according to claim 1, characterized in that: The second humidity regulating structure comprises a containing tank disposed at the upper end of the evaporation well, wherein the containing tank contains evaporable liquid.

6. The flow measurement device according to claim 1, characterized in that: The first distance is smaller than 1 / 2 of the outer diameter of the liquid outlet.

7. The flow measurement device according to claim 2, characterized in that: The packing assembly comprises a sealing packing and an exhaust pipe. The sealing packing is made of a material with low water absorption rate, and the exhaust pipe runs through the sealing packing.

8. The flow measurement device according to claim 7, characterized in that: The inner diameter of the exhaust pipe is smaller than the inner diameter of the liquid outlet pipe.

9. A flow measurement method, characterized in that: Using the flow measurement device according to any one of claims 1 to 8, and the following steps: Squeeze the liquid of the measured flow rate from the liquid outlet of the liquid outlet pipe to form a slightly convex liquid surface; Using the liquid receiving port of the capillary receiving tube to absorb the liquid squeezed out of the liquid outlet at a time interval of T1; After the liquid drips from the liquid outlet of the capillary receiving tube into the liquid collecting container for the first time, reading the reading of the weighing balance at each T1 time interval; The liquid flow rate is determined based on the reading of the weighing balance at each T1 time.

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